%%%\documentclass{article}
%%%\usepackage[x11names, rgb]{xcolor}
%%%\usepackage{tikz}
%%%\usetikzlibrary{decorations,arrows,shapes}
%%%\begin{document}
%%%
\begin{tikzpicture}[>=latex',join=bevel,domain=0.4:4.6,scale=0.72]
    \draw[->] (-0.4,0) -- (4.2,0) node[below] {tempo};

%   \foreach \x in {0,2,3}
 %    		\draw (\x,0.1) -- (\x,-0.1);

%\draw (0, 0) node[below] {$a_i$};
%\draw (2, 0) node[below] {$t_i$};
%\draw (3, 0) node[below] {$d_i$};

%\draw [<->,red]   (0,1.3) -- (2,1.3) node [black,sloped,midway,above] {$t_i^{\prime}$};

%\draw [<->,blue] (2,1.3) -- (3,1.3) node [black,sloped,midway,above] {$t_i^{\prime\prime}$};

\path[draw=black,fill=yellow!50]   (    0, 0.1) --++ (2,0) --++ (0,0.5) -++ (-2,0) --cycle;
\path[draw=black,fill=yellow!50]   ( 0.5, 1.1) --++ (2,0) --++ (0,0.5) -++ (-2,0) --cycle;
\path[draw=black,fill=yellow!50]   (    1, 2.1) --++ (2,0) --++ (0,0.5) -++ (-2,0) --cycle;
\path[draw=black,fill=yellow!50]   ( 1.5, 3.1) --++ (2,0) --++ (0,0.5) -++ (-2,0) --cycle;

\draw (   1, 0.35) node {1};
\draw (1.5, 1.35) node {2};
\draw (   2, 2.35) node {3};
\draw ( 2.5, 3.35) node {4};

\path[draw=black,->] (   0, 0.35) to [out=180, in=180] (0.5, 1.35);
\path[draw=black,->] ( 0.5, 1.35) to [out=180, in=180] ( 1, 2.35);
\path[draw=black,->] (   1, 2.35) to [out=180, in=180] (1.5, 3.35);

\draw (  -1, 0.85) node {$bis(1)$};
\draw ( -0.5, 1.85) node {$bis(2)$};
\draw (   0, 2.85) node {$bis(3)$};

\end{tikzpicture}
%%%
%%%\end{document}